Please look out for good peering to the previous/next mix in the cascade you're going to build with your fellow mix operators. Peering is essential for good mix performance. Please check the number of hops using traceroute and packet losses and other failures as well as latency.
If you want to run more than one mix on your root server or run other services as well think about virtualization. You will need at least one IP address for your host system and at least one additional IP address for every virtual server.
